pinctrl: renesas: r8a779h0: Add QSPI pins, groups, functions

Add pins, groups and functions for the QSPI functionality proviced by
the SPI Multi I/O Bus Controller (RPC-IF) on the Renesas R-Car V4M
(R8A779H0) SoC.

Signed-off-by: Cong Dang <cong.dang.xn@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/ebe123bca4888382bc76ccf1a3a9e85ced31f3f3.1706264667.git.geert+renesas@glider.be